Module for merging vecotrs into one single.
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The vectors to merge have to have the same attribute table, in this case all the features will be put together into the new vector updating also the attribute table.
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<h3>Inputs</h3>
<ul>      
<li>the input vectors to be merged, a list of vectors comma separated</li>
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<h3>Output</h3>
<ul>      
<li>the output merged vector</li> 
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